Differential gearing.



Patented runs 17, I902.

"GVH. 0. HAMANN. DIFFERENTIAL GEARING.

(Application filed Dec. 3, 1900.)

(No Model.)

UNITED STATES PATENT OFFICE.

CARL HEINRICH OTTO HAMANN, OF BERGEDORF, NEAR HAMBURG,

V GERMANY.

DIFFERENTIAL GEARING.

SPECIFICATION forming part of Letters Patent No. 702,793, dated June 17,1902. Application filed December 3,1900. Serial No.38,543. on model.)

To all whom it may concern:

Be it known that I, CARE HEINRICH OTTO HAMANN, a subject of the German Emperor, and a resident of Bergedorf, near Ham V a side elevation, partly in section, on the line I II, Fig. 2; and Fig. 2 a central vertical crosssection of the improved differential gearing constructed and arranged in accordance with my invention. Figs. 3 to 6 are views similar to that shown by Fig. 1, drawn on a somewhat smaller scale and illustrating the action or mode of operation of the said gearing.

According to the constructional form of gearing a driving-shaft aisfurnished with an eccentric b, and upon the latter. is loosely mounted a disk or wheel c,which is surrounded by a stationary undulating guide course or ring t, mounted within a'cylindrioal casingd. The dimensions and proportions ofthese parts are such that the wheel 0 is always at one point incontact with or bearing on the guide course or ring 2'. The wheel 0 is provided at three points (or more, if required) with guiderollers is, attached to said wheel bymeans of headed screw-bolts or the like. The rollers 7c are set at equal radial distances from and at equal angles apart around the center of the wheel 0.

The operation of theabove-described gearing is as follows: When the driving-shaft a. is rotated, the eccentric 12 rotates and the wheel 0 is rolled along, with its guide-rollers k on or in the undulated guide-ring 'iand revolves at the same time around'its center, which revolution is of a lower rate of speed and opposite to that of the eccentric b or driving-shaft a, respectively. The transmission depends upon the proportion of the eccentricity of the driving-eccentric to the radius of the circle passing through the center of the guide-rollers It. The transmission of the roll- ,suchlinks maybe-provided. The distance between the pivots or studs m and n, measured from center to center, is again. equal to the ecccentricity of the driving-eccentric b. When the gearing is in operation, the linksl draw the disk It around and are'revolved at.

the same time about themselves-11. 6., about the pivots mand 'n. The angular velocity of the links Z is equal to that of the driving-eccentric or driving-shaft, respectively, so that the said links after a complete revolution of the drivingshaft have performed, besides their progressive motion,also a complete revolution abouttheirpivots. This gearingis suitable for use inheavy engines for transmitting rotary power at a proportionately smaller increase or reduction of speed. I

Having fully described my invention, What I claim, and desire to secure by Letters Patent, is-

1. The combination with a driving-shaft, an eccentric thereon, a wheel on said eccentric androllers carried at the periphery of said wheel; of an internally-toothed drum larger than. said wheel, the rollers of which are arranged to engage the teeth on said drum during the revolution and rotation of the wheel, a driven shaft concentric with the driving-shaft, a spider thereon and a link connection between said spider and wheel, substantially as and for the purpose set forth.

2. The combination with a driving-shaft, an'ecoentric thereon,-a wheel on said. eccentrio androllerscarried by'the wheel; of a drum, provided with an undulating inner surface, larger. than saidwheel, the rollers of which are adapted to travel over said undulating surface, a driven shaft concentric with the driving-shaft, a spider thereon anda connection between the'wheel and spider capable of revolving and rotating, substantially as and for the purpose set forth.

CARL HEINRICH OTTO HAMANN. 

